10 results about "Cellulose preparation" patented technology

This invention discloses a method for preparing a lignin-coated cellulose nanofiber sodium-ion battery separator, relating to the fields of electrochemistry and battery separator technology. The preparation method includes: pretreating bamboo particles using a hydrothermal method; subsequently, nano-sizing the bamboo particles using a mechanical dissociation method to obtain a lignin-coated cellulose nanofiber suspension; and then forming a thin film from the lignin-coated cellulose nanofibers using a vacuum filtration method. The lignin nanoparticle-coated cellulose preparation process used in this invention is direct, simple, efficient, and environmentally friendly, eliminating the need for chemical reagents such as acids and alkalis to remove hemicellulose and lignin. Furthermore, the lignin nanoparticle coating effectively improves the diffusion rate of sodium ions during charge and discharge, as well as the discharge specific capacity and cycle stability.

The invention discloses a bamboo cellulose preparation raw material inventory management system based on a block chain, particularly relates to the field of chain inventory management, and is used for solving the problems of quality attenuation, cross-warehouse allocation and low transaction triggering intelligence degree of traditional bamboo cellulose raw materials in a storage cycle. The method comprises the following steps: constructing a raw material digital fingerprint by collecting core physical characteristics and batch information of a bamboo cellulose raw material; predicting the quality change of the next transaction time window based on the quality dynamic attenuation model in combination with the storage environment parameters, and exposing the risk in advance; when the attenuation amplitude exceeds a threshold value, automatically entering on-chain auction, and electing a transaction object according to anonymous bidding and reputation weight; and for the inventory of the continuous flow beat, calculating an allocation priority index through a global inventory map and automatically executing cross-warehouse allocation. According to the mechanism, credible recording, dynamic early warning and automatic decision making of the whole inventory management process are achieved, and the raw material circulation efficiency and the quality management capability under multi-warehouse cooperation are improved.

The present invention belongs to daily life necessary field, and specifically provides herein below biodegradable diaper / sanitary pad from sugar cane bagasse and the process thereof. The sanitary pads described above is used to manage menstrual flow during menstruation, providing a hygienic and comfortable way to absorb menstrual fluid. Specifically the process comprising of pre-treatment and delignification of sugarcane bagasse, Nano-cellulose preparation and modification, integrating zinc oxide (ZnD) nanoparticles with sugar cane bagasse, pad layering and structural design.

The invention belongs to the field of cellulose preparation, and particularly relates to a method for preparing nano cellulose based on cumin straw and application of the method in Pickering emulsion. According to the method, agricultural waste cumin straw is taken as a raw material, nano-crystalline cellulose (CSNc) is prepared through a multi-stage process of alkali treatment, oxidation bleaching and acid hydrolysis, and the effect of the nano-crystalline cellulose on stabilizing cumin oil Pickering emulsion is researched. A sulfuric acid hydrolysis process is optimized through a single factor experiment and a response surface method (Box-Behnken design), the optimal conditions are determined as follows: the sulfuric acid concentration is 60%, the temperature is 50 DEG C, the time is 55 min, and the CSNc yield reaches 5.57 + / -0.21% at the moment. TEM characterization shows that CSNc is of a rod-like nanostructure, the average width is 16.93 nm, the length is 253.06 nm, the absolute value of surface Zeta potential is high (zeta is equal to 45.6 mV), and it is indicated that CSNc has good colloidal stability. The CSNc is applied to a cumin oil emulsion system, the oil-in-water (O / W) Pickering emulsion is successfully prepared, and the particle sizes of liquid drops of the emulsion are uniform.

The invention discloses polyanionic cellulose for petroleum drilling and a preparation method thereof, and belongs to the technical field of polyanionic cellulose preparation. The method comprises the steps of cellulose activation, silane grafting, NaA type molecular sieve in-situ growth and post-treatment. Activated cellulose is subjected to amination modification through a silane coupling agent KH-792, then a NaA type molecular sieve is grown on a cellulose skeleton in situ through a microwave hydrothermal method, and a stable inorganic-organic hybrid structure is formed. The structure can construct a cellulose-molecular sieve three-dimensional physical cross-linked network in a solution, synergistically exerts the effects of ion fixation, heat shielding and moisture slow release of the molecular sieve, effectively solves the problems of rapid viscosity reduction and filtration loss control failure of traditional PAC in a high-temperature and high-salt environment, and is suitable for severe drilling conditions of deep wells, ultra-deep wells and the like.

The present application is suitable for the technical field of microcrystalline cellulose and high polymerization degree cellulose preparation, and provides a combined preparation process of microcrystalline cellulose and high polymerization degree cellulose, which comprises the following steps: step (1), pretreatment; step (2), cooking; step (3), black liquor extraction; step (4), bleaching and pulp washing; step (5), grading; step (6), mixing, reaction and dilution; step (7), washing; step (8), pressure filtration and concentration; and step (9), drying, crushing and screening. The present application grades the bleached cellulose by using a grading screen, separates the component consisting of short fibers and miscellaneous cells which can produce microcrystalline cellulose and the single high polymerization degree cellulose component, then performs conventional acid hydrolysis and multi-stage countercurrent washing, concentration, drying and crushing on the short fiber and miscellaneous cell mixed component, and then grades the dried microcrystalline cellulose product by using various dry grading equipment, separates the acid hydrolysis microcrystalline cellulose product consisting of short fiber component for sale, and separates the acid hydrolysis microcrystalline cellulose component consisting of miscellaneous cell component for sale as a byproduct of special microcrystalline cellulose.

The invention belongs to the technical field of cellulose preparation, and particularly relates to hydrophobic cellulose and a hydrophobic modification method thereof. In order to solve the problems that an existing cellulose hydrophobic modification method is complex, and chemical reagents are not environmentally friendly, the invention provides a cellulose hydrophobic modification method which comprises the following steps: adding cellulose into a mixed acid modifier for esterification reaction, and then washing with water, the ratio of the cellulose to the mixed acid is (30-100): 1 g / L; the mixed acid system is prepared from 15 to 25 weight percent of HNO3, 35 to 50 weight percent of H2SO4 and 30 to 40 weight percent of water. Water-proof and oil-proof test results show that the water-proof and oil-proof effects of the modified cellulose can reach higher levels, so that the modified cellulose has a better hydrophobic effect. Therefore, the hydrophobic cellulose obtained by the modification method has potential commercial value in replacing plastic packaging and disposable environment-friendly products.

The application discloses a kind of intelligent automation feeding and discharging system suitable for cellulose, and it relates to the field of new solvent method cellulose preparation.The system includes upper and lower communication variable-diameter feeding channel and blanking main channel, high-end communication blanking main channel upper part right side face side open, low-end and external warehousing system communication discharging chute assembly, automatic baffle valve assembly installed in blanking main channel inner chamber, switch between working station and auxiliary station, intelligent cleaning mechanism around blanking main channel, and DCS control system.The application is designed with two material channels, and the automatic baffle valve assembly is automatically turned over by linkage control to realize flexible switching between working station and auxiliary station, to meet the intelligent automatic conversion between normal production state and process debugging, maintenance or cleaning and other abnormal production state, to realize intelligent automatic cleaning by linkage control of intelligent cleaning mechanism opening and closing, to provide protection for realizing unmanned workshop and green workshop.

The invention discloses temperature-resistant and salt-resistant polyanionic cellulose and a preparation method thereof, and belongs to the technical field of polyanionic cellulose preparation. The method comprises the following steps: activating bleached wood pulp or cotton pulp cellulose by using low-concentration NaOH, and grafting in an alcohol-water system by using gamma-aminoethyl-gamma-aminopropyl trimethoxy silane (KH-792), so as to obtain aminated cellulose; then adding the aminated cellulose into the UiO-66-NH2 precursor sol, and carrying out microwave in-situ growth of an MOF crystal shell to form a core-shell structure; and finally, freeze-drying to construct the hierarchical porous aerogel, and crushing to obtain the finished product. Furthermore, ion exchange can be further carried out through a CaCl solution, so that Ca-UiO-66-NH2 (at) Cellulose is obtained. The apparent viscosity of 1 wt% of the product in saturated salt water is greater than or equal to 65 mPa.s, the viscosity retention rate after aging at 180 DEG C for 16 h is greater than or equal to 90%, the API filter loss is less than or equal to 6 mL, and the product is suitable for filtrate loss reduction and viscosity improvement of the deep well high-calcium drilling fluid, and has temperature resistance, salt resistance and environmental protection performance comprehensively superior to those of commercially available PAC.

The invention discloses cellulose and a preparation method thereof, and belongs to the technical field of cellulose preparation. Comprising the following steps: sequentially cleaning and drying plant raw materials, and crushing to obtain plant raw material particles; mixing the plant raw material particles with a strong alkali solution to obtain high-alkalinity plant primary pulp; adding water to dilute the high-alkalinity plant primary pulp, and then adding amylase for catalytic desizing to obtain desized plant primary pulp; adding a bleaching agent into the desized plant primary pulp to obtain bleached plant primary pulp; carrying out post-treatment on the bleached plant primary pulp to obtain pure plant fibers; and sequentially fermenting, extracting and refining the pure plant fibers to obtain the high-purity cellulose. After desized plant raw stock is bleached, the bleached plant raw stock is subjected to post-treatment, and through the steps of extrusion filtration, precipitation, washing and the like, fine impurities and excessive water in the plant fiber raw material are removed, and the purity of the cellulose raw material is improved.